Narrative:

On aircraft XXX flight crew reported that flying in navigation (FMC) mode first officer's HSI CDI needle froze with navigation flag in view (intermittently). I was able to duplicate problem on ground and verified problem was due to a bad HSI (needle/flag intermittently sticking). I removed the faulty HSI to gain access to air carrier port #XXXX HSI which I found was not in stock at ZZZ. I made numerous calls to our maintenance control foreman in ZZZ1, but was unable to get anyone. I notified the maintenance tower coordinator here in ZZZ of the situation and he said he would get proper authority/authorized to rob an HSI from another aircraft. I gave him the air carrier part number XXXX and continued to work the 4 other aircraft that currently had avionics write-ups. Later I was contacted by our maintenance tower coordinator with authority/authorized of our maintenance duty manager to rob the first officer's HSI from aircraft YYY. I was also given a rob authority/authorized control number issued by the maintenance duty manager with stores (the department responsible for parts). I removed the part from aircraft YYY, made a logbook entry - first officer's HSI removed for XXX and completed the robbed part tag. I installed and completed a satisfactory operational check of the first officer's HSI on XXX and removed the aircraft from CAT ii/IIIA per our mpp procedures. Please note there was no air carrier part placard on the robbed HSI and I had to use the manufacturer serial number for the installation paperwork. The aircraft was then dispatched for revenue service. I was notified 3 days later the part removed from aircraft YYY was the wrong effectivity for aircraft XXX and was later replaced with part number XXXX that I originally requested.

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Original NASA ASRS Text

Title: A B737-400 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT FO'S HORIZ SIT INDICATOR INSTALLED.

Narrative: ON ACFT XXX FLC RPTED THAT FLYING IN NAV (FMC) MODE FO'S HSI CDI NEEDLE FROZE WITH NAV FLAG IN VIEW (INTERMITTENTLY). I WAS ABLE TO DUPLICATE PROB ON GND AND VERIFIED PROB WAS DUE TO A BAD HSI (NEEDLE/FLAG INTERMITTENTLY STICKING). I REMOVED THE FAULTY HSI TO GAIN ACCESS TO ACR PORT #XXXX HSI WHICH I FOUND WAS NOT IN STOCK AT ZZZ. I MADE NUMEROUS CALLS TO OUR MAINT CTL FOREMAN IN ZZZ1, BUT WAS UNABLE TO GET ANYONE. I NOTIFIED THE MAINT TWR COORDINATOR HERE IN ZZZ OF THE SIT AND HE SAID HE WOULD GET PROPER AUTH TO ROB AN HSI FROM ANOTHER ACFT. I GAVE HIM THE ACR PART NUMBER XXXX AND CONTINUED TO WORK THE 4 OTHER ACFT THAT CURRENTLY HAD AVIONICS WRITE-UPS. LATER I WAS CONTACTED BY OUR MAINT TWR COORDINATOR WITH AUTH OF OUR MAINT DUTY MGR TO ROB THE FO'S HSI FROM ACFT YYY. I WAS ALSO GIVEN A ROB AUTH CTL NUMBER ISSUED BY THE MAINT DUTY MGR WITH STORES (THE DEPT RESPONSIBLE FOR PARTS). I REMOVED THE PART FROM ACFT YYY, MADE A LOGBOOK ENTRY - FO'S HSI REMOVED FOR XXX AND COMPLETED THE ROBBED PART TAG. I INSTALLED AND COMPLETED A SATISFACTORY OPERATIONAL CHK OF THE FO'S HSI ON XXX AND REMOVED THE ACFT FROM CAT II/IIIA PER OUR MPP PROCS. PLEASE NOTE THERE WAS NO ACR PART PLACARD ON THE ROBBED HSI AND I HAD TO USE THE MANUFACTURER SERIAL NUMBER FOR THE INSTALLATION PAPERWORK. THE ACFT WAS THEN DISPATCHED FOR REVENUE SVC. I WAS NOTIFIED 3 DAYS LATER THE PART REMOVED FROM ACFT YYY WAS THE WRONG EFFECTIVITY FOR ACFT XXX AND WAS LATER REPLACED WITH PART NUMBER XXXX THAT I ORIGINALLY REQUESTED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.